java中的传值与传reference .

//: c03:Assignment.java
// Assignment with objects is a bit tricky.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

// edit by nx.

class Number {
int i;
}

public class Assignment {
public static void main(String[] args) {
Number n1 = new Number();
Number n2 = new Number();
n1.i = 9;
n2.i = 47;
System.out.println("1: n1.i= " + n1.i + ", n2.i= " + n2.i);
n1 = n2;
System.out.println("2: n1.i= " + n1.i + ", n2.i= " + n2.i);
n1.i = 27;
System.out.println("3: n1.i= " + n1.i + ", n2.i= " + n2.i);
}
}




RUN:

1: n1.i= 9, n2.i= 47
2: n1.i= 47, n2.i= 47
3: n1.i= 27, n2.i= 27